Basic Rendering Techniques Product Design Sketching

Basic Attributes of Colour A colour can be denoted by its HSB value, i.e. the 3 attributes:  Hue (its location in a colour spectrum)  Saturation (the intensity of colour pigment)  Brightness (the intensity of light)

Saturation vs. Brightness saturation brightness

HSB Values You may use the colour picker of Adobe PhotoShop to identify the HSB values of your colour pencil Adjust hue and saturation Adjust brightness

Creating Different Tones Using Dry Media Three ways to create tones: 1.By intensity of pigment / strokes 2.By using different degrees of colour saturation 3.By using colours of different colour temperatures (hues)

Varying Intensities Greater stroke pressure represents shade Medium pressure represents mid-tone Lowest pressure represent highlight Best for light colours

Varying Saturations Reduce the saturation either by  choosing a colour of a lower saturation value; or  Using grey / black colour as a blending agent Best for natural colours

Varying Colour Temperatures Use a warmer hue (e.g. orange) than the midtone colour for highlights Use a cooler hue (e.g. blue or purple) for shades Best for vivid colours

Colour of an Object The color of an object being seen is determined by:  Local colour (of the object’s surface material)  Ambient colour (of the light source)  Reflected colour (from another object’s nearby)

Light and Shades Identify different light zones and then create tonal values: 1.Highlight 2.Middle tone 3.Shade 4.Backlight (for curved surface)

Shades and Shadows Shade is the surface or area of a surface not facing the light source Shadow is the area of a surface blocked by other objects or by other parts of the same object

Casting Shadows 1.Use projection lines to simulate the light rays 2.Matching key points along the object’s contours on the surface on which the object is placed 3.Define the edge of the shadows 4.Render with a cooler colour

Shading the Cube Product Design Sketching Activity